Malicious PDF — malware analysis report

Static analysis result for SHA-256 043b222e63946751…

MALICIOUS

PDF

77.7 KB Created: 2021-09-13 12:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b17a105cb67951387020d4a8a031fb6 SHA-1: 7e9f2a70fd4fa059439d94a8853dedc6c4b45b76 SHA-256: 043b222e63946751b552e756d328cd528e6ca4d1cd1a1b12a6fc02a914e873d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, some pointing to compromised CMS upload storage, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dinhviht.com/images/newtech/files/xamomoviporigeruroligonip.pdf In PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/fabagod.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/pusozezunomugakorezenep.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/3218186024.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/funak.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/49416194216.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/71763163206.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/23890429248.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e18041210b---48925909023.pdfIn PDF document text
    • https://derfo.info/resimler/files/takebono.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/nalijomepoto.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/toxufeseginudujo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4bb263f4d3cfe545575170f7cffbc57b/temapowasujipomufo.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/jinov.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/64817922625.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3bee40c8---tulezubewadiralesik.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/lufijuvupumogomofivew.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/mitexisul.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/16576635215.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/fawebopeli.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/dizewemanikegi.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/kigepaliwifutifosixafixi.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/tegarujaxidukeza.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/kimipar.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/92801404908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=windows+movie+maker+classic+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 18132 bytes
SHA-256: 3265bfa98891290d46b468d6b0bdd35cbcc0502c633be0c2824c032c51edfdb5
font_02_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 10668 bytes
SHA-256: d6808c119523ce66ae34db6c328eaa0a8af58e19ac69086d6b792046fd52392c